Make Your Own Noise-Isolating Earbuds from Silicone and Old Earplugs

The best earbuds offer some noise isolation, but if the ones you have are awful or keep falling out of your ears, Instructables user NightHawkinLight has a method to make your own, customized noise-isolating earbuds using a pair of reusable earplugs, some clear silicone, and a little elbow grease.